Here is a list for some of the nicer Velious armor:
https://wiki.project1999.com/Velious_Tailoring
Im average about 1 in 3 combines to be successful, worse is about 1 in 5 maybe 6, best ive had was 4 in a row, one of those EQ things. From what im told a 250 tailor is guarantee 1 in 3 odds on combines, wait til im cap if you dont wanna farm extra material for possible failures.
Name is Andain in game, pm/reply /ooc for me.